S1, E3: Our 10 remaining contestants must brave the elements of the brutal Martian desert to find out who has what it takes to survive when an unexpected fire breaks out in the hab. This week's mission will test the stars' survival skills and will earn them the coveted survivalist mission patch. Depending on the success of the mission, the assigned Mission Commander will either determine who is "Mission Critical" or be at risk of being extracted and sent back to Earth.